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INDIAN RIVER COUNTY MITIGATION REEF PROJECT TECHNICAL AND ENVIRONMENTAL SPECIFICATIONS 17. 12 Low Relief Low Complexity ( LRLC) . As indicated in the plans , the LRLC reef shall be comprised of a single layer of stone . Boulders shall touch one another to the greatest degree possible but shall not be stacked on top of one another. The reef footprint will contain approximately 20% open sand surface , designated in the Plans and Construction Drawings as the 120400t by 10-foot rectangular spaces between the 120- foot by 50400t reef units . A total of 0 . 28 acres of LRLC reef shall be constructed as shown in the Plans . 17 . 13 Minimum Coverage . To ensure that the reefs are constructed and deployed as shown in the Plans and that sufficient rock is available to allow (at a minimum ) a single layer of rock (for the 0 . 28 acres of LRLC reef) with a vertical relief of 1 foot to 2 feet above the bed and 4 . 96 acres of HRHC reef with a vertical range to vary between 3 feet and 6 feet from the surface of the bed , the CONTRACTOR shall observe the following procedures : a . The CONTRACTOR shall place marker buoys at each end of the reefs to be constructed . The Mitigation Area Coordinate Table , identified on the construction Plans , has designated corner locations for transition areas associated with reef placement. The CONTRACTOR shall provide a means of precisely stabilizing the barge while the rock is off-loaded . At a minimum , the CONTRACTOR shall establish temporary buoys during deployment using DGPS with sub-meter accuracy. b . If the barge is to be moored , the CONTRACTOR 'S divers shall attach construction buoys , easily visible to the tug operator, at the marked locations and determine the suitability of the location to withstand the strain of the barge mooring lines . If the CONTRACTOR'S indicated point is not deemed suitable for attaching the mooring lines , the CONTRACTOR ' S divers shall select the nearest suitable alternate mooring point. 17 . 14 Turbidity Concerns . The CONTRACTOR shall use whatever special equipment or methodology is necessary to load the reef materials on the barge and place the materials at the site in a manner to avoid picking up quantities of sand or silts that may cause turbidity violations . The CONTRACTOR shall ensure that all employees involved in loading and placing rock in the water understand the causes of turbidity and the maximum level of turbidity allowed in the Project Area , A COUNTY and/or state representative may be on-site while rock is being placed in the water to measure turbidities and shall vigorously enforce this requirement . If the CONTRACTOR violates any condition of any Permit or work is stopped by any public entity, any additional costs incurred by the COUNTY, including any fines , shall be paid by the CONTRACTOR at no additional cost to the COUNTY. 18 . 17 Varied On -site Conditions . Precise placement of all materials is critical to the success of the project . Visibility at the site may be limited and tidal currents can be strong , complicating construction . The CONTRACTOR shall provide any and all personnel and equipment and employ whatever methodology necessary and acceptable TS- 13